Principal causes of atmospheric motion

Thèmes abordés

Physics, Physique, mouvement atmosphere atmospherique, motion, causes, dynamics, fluid, earth

Résumé du document

All parts of the atmosphere does not receive energy in a homogeneous manner. This difference leads to air motion following the principle that warm air is likely to reach high altitudes due to its low density compared to cool air. The difference in temperature and pressure is one of the key points responsible for atmospheric motion. In this study, we will try to give a simple and complete description of the principal causes of motion in our atmosphere and explain an impressive phenomenon linked to atmospheric instability, avoiding any annoying calculation, simply by referring to our logic.

The general dynamism of atmosphere refers to all the causes of air displacement in the atmosphere. These tendencies are under the influence of a force: the Coriolis Force which is responsible for curbing atmospheric trajectory. We should also deal with other factors on which atmospheric motion depends. The effect of gravity issues directly from the problem of air density, so it should be taken into account as well as the rotation of the earth characterized by the Coriolis force. Under these assumptions, one needs to set limits to the problem to comprehend it and to make it as much realistic as possible.

Extraits

[...] The model and explanation about air motion in the atmosphere is quite simple but reflects for a great part the real motion, the complete study of this kind of motion is very complex and crucial in its applications such as weather forecasting. Nowadays we are able to explain loads of phenomena taking into consideration an increasing number of factors; however we should not boast since we remain weak in fighting against what we still call natural disasters. Kamel Bouzebra Principal causes of motion of the atmosphere. [...]

[...] Principal causes of motion of the atmosphere. PRINCIPAL CAUSES OF MOTION OF THE ATMOSPHERE Kamel Bouzebra Principal causes of motion of the atmosphere. The atmosphere doesn't receive homogeneously the same amount of energy. This difference leads to air motion following the principle that warm air is likely to reach high altitudes because of its low density compared to cool air. The difference in temperature and pressure is one of the key points responsible of the motion of atmosphere. In this study we will try to give a simple and complete description of the principal causes of motion in our atmosphere and one explanation of an impressive phenomenon linked to the air instability, avoiding any annoying calculation, simply by referring to our logic. [...]

[...] During the day, when the sun heats the ground, the air imprisoned under this inversion is heated even more and can also become wetter because of evaporation. If the zone of inversion is locally eroded by mixtures with the sub-base or if phenomena on a large scale raise it in block, the surfacing become very unstable spouts out violently at certain places. The air on the Kamel Bouzebra Principal causes of motion of the atmosphere. surface of the ground runs out then horizontally towards these points of eruption and the shape of high clouds of storm. [...]

[...] (Fig.1) Fig.1 Simple convective cells of atmosphere Fig.2 Real convective cells In reality air doesn't wait until the pole to get cooled, it happens earlier forming smaller cells around the globe called cells of Hadley, cells of Ferrel the different names stand only because cells have been discovered in different latitudes by different scientists (Fig.2). Now if we get closer to what it is really happening, by adding the rotation of earth we Kamel Bouzebra Principal causes of motion of the atmosphere. should consider the Coriolis force and added to the action of convective cells, the air trajectory is deflected and infer in what is called horizontal displacement. [...]

[...] This mass is replaced at the ground level by cooler air from higher layers producing gusts. By night the ground is cooler which slows the rhythm of the previous cycle, weakening gusts on the surface and strengthening winds in high altitude. The difference of temperature is in a large part responsible of the instability of air and many consequences result from the phenomenon like storms, tornados . An unstable atmosphere is made up in general of a layer of air of surface, wet and hot, overcome drier cold air. [...]